A work of art, typically a painting or carved relief, designed to be placed behind or above an altar in a church or chapel. These religious artworks serve both decorative and devotional purposes, often depicting scenes from Christian theology or the lives of saints.
From Middle English, combining 'altar' (from Latin 'altare' meaning raised platform for sacrifice) and 'piece' meaning artwork. The concept developed in medieval Christianity as churches became centers for elaborate artistic decoration.
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